Fuel-mixing device



M y 1929- s B. DAUGHERTY FUEL MIXING DEVICE Fil ed Oct. 12, 1926 ,0 mm: m 1

Ana a! 'F'ig.2.

Patented May 21, 1929.

UNITED, ST EE SAMUEL B. DAUGHERIY OF OIL CITY, PENNSYLVANIA.

FU'EL-Ii/IIXING DEVICE.

.- Application filed October 12, 1926'. Serial No. 141,114.

This invention relates to a carburetor or fuel supplying device for gas engines.

The objects of this invention are to obtain a more homogeneous mixture of the gas and air, also to eliminate the presence of a considerable volume of mixture heretofore existing between the regulating valves and the cylinder of the engine, also to secure greater economy in the use of fuel, also to prevent backfiring, and to produce a uniform distribution of the gas into the air so as to secure the most effective combustion of the fuel and yield the maximum power.

In the accompanying drawings:

Fig. 1 is a fragmentary longitudinal section of a gas engine equipped with an approved form of carburetor containing my invention. j

Fig. 2 is a cross section of the same taken on line 2-2, Fig. 1.

Fig. Sis a longitudinal section, on an enlarged scale of one of the gas nozzle shown in Figs. 1 and 2. Fig. 1 is a plan view of a slightly modified form of gas nozzle constructed in accordance with my invention.

In the following description, similar characters of reference indicate corresponding parts in the several views of the drawings. 1

The numeral represents a part of the power cylinder of a gas engine surrounded by the usual water jacket 11, and provided in its side with an inlet 12 for the combustible fuel mixture whereby the piston in this cylinder is driven.

The inlet valve mechanism which controls the admission of the fuel mixture into the cylinder through said inlet and the carbureter or fuel mixing device associated therewith may be variously organized to embody my improvements but the form of the same shown in Figs. 1, 2 and 3 has been found satisfactory in practice and as there shown, the same is constructed as follows:

Arranged opposite the outer end of the fuel inlet 12 is a valve casing 13 of substantially tubular form which contains a mixing chamber communicating'at its innerend by a port 14 with the fuel inlet 12 and provided at its outer end with a laterally projecting air tube 15 through which air is supplied to the carbureter from any suitable source. The valve casing in its preferred form is made separate from the body containing the power cylinder and its acket, and this casing is mounted on the engine body so as to form an annular fuel distributing chamber 16 between the valve casing and the engine body adjacent to the port of the mixing chamber. The connection between this valve casing and the cylinder body is preferably effected by fitting the inner end of this casing against a shoulder 17 on the cylinder body and providing the casing with a laterally projecting flange 18 which is secured to the body by means of screws 19, as shown in Fig. 1, or by any other suitable means.

The distributing chamber receives its supply of gaseous fuel through a supply passage 20 in its side, which passage receives gas from any available source, and in any approved manner. If desired the fuel supply passage may be formed in the valve casing, as shown by dotted lines 120 in Figure 1. For the purpose of preventing leakage to and from the distributing chamber, a packing 21 is interposed between the inner end of the valve casing and the shoulder 17 of the body, and a similar packing 22 is arranged between the flange 18 of the casing and the adjacent part of the body.

At its inner end, the valve casing is pro vided with a valve seat 23 around its port 14; and an inlet valve 24; is movable toward and from this seat for opening and closing this port, and either admitting a combustible mi x ture into the cylinder or shutting off such admission.

For this purpose the inlet valve may be mounted in any desired manner, but prefer ably by mounting the same on the inner end of a valve stem 25 which slides in a guideway 26 arranged centrally and lengthwise in the valve casing, and which is adapted to be actuated by any suitable or well-known mechanism, so as to open and close the inlet valve at the proper time. 7 r

Arranged in an annularrow within the fuel mixing chamber around the valve stem adja cent to the fuel port 14, area plurality of fuel supply nozzles each of which is arranged radially relatively to the axis of the valve casing, and has its outer. end mounted 011 the casing so as to communicate with the fuel distributing chamber 16 while its inner end terminates short of the adjacent part of the valve stem, and its inner longitudinal side is provided with an outletopening into the mixing chamber.

In the preferred construction of this nozzle, the outer part 27 of the same is of cylindrical form and secured by a driving fit in an opening 28in the valve casing, and the inner part 29 of the nozzle is of inwardly tapering form which permits the corresponding inner ends of a plurality of such nozzles to be placed close together. The outlet of each nozzle is preferably constructed in the form of a slot 30 on its inner longitudinal side, and the innerend of the same is preferably closed. In making this nozzle a tubular blank is first flattened so that its inner part is oftapering form, but leaves an elongated opening at the inner end of the blank and is about equal in width to the width of the outlet slot 30 to be formed on the nozzle. k

After such flattening of the blank has been efl ected the outlet slot 30 is cut therein by a milling tool inany usual manner, and then a strip shaped mandrel is slipped through the slot in the blank closeto the inner end of the same and the end parts of the l blank are pinched together by a vise or otherwise so as to close the inner end of the blank, as shown at 31, after which the mandrel is removed, thereby completing the nozzle ready to be inserted withits outer end in anopening 28' in the valve casing. Such insert is effected so thatthe outlet slot of the nozzle 1s arranged on the inner longitudinal side of the In the operation of this carburetor or fuel mixing device, the air on its way throughthe valve casing to the cylinder passes in streams through the plurality ofga-ps formed between the several nozzles and at the same time gas issues in the form of thin ribbonlike streams fronr the slotted inner sidesof the nozzles, which streams of air and gas alternate 1n direction circumferentially of th'e'valve casing, and unite with each other in the inner end of the valve casing and before issuing through the outlet ofthe same.

A thorough homogeneous m1xture of the air and gas is by this means obtained in which the combustible elements of'the gas are finely divided 'and'distri-buted so that a mixture is obtained which-isof uniform consistency in all of its parts,thus insuring complete consumption and a maximum output of power.

The theory that has been formulated to 7 account for backfiring is that with the ordt nary arrangements for mixing air and gas, a

burning when the inletvalve opens to admit a fresh charge. The lingering flame ignites the incoming charge and it fires back into the inlet passage. With this improved arrangement the combustion is so rapid with the uniform mixture that there is no flame to ignite the incoming charge. Definite attempts have been made to get an engine thus equipped with these improved valves, to back fire, but without success, so that this theory is pretty well prevent If there werea flame in the cylinder when thusa freshcharge is admitted, the mixture would be fired.

Moreover the greater intimacy which is obtained in the mixture of air and gas by the use of this carbureter insures greater'economy in fuel consumption.

I claim as my inventioni 1. A carbureter comprising a mixing chamber having an outer air inlet and an inner mixture outlet; a gaseous fuel supply chamber surrounding the mixing'chamber; and a plurality of gaseous fuel delivery nozzles arranged radially in an annular 'row within the mixing chamber around the axis thereof and each having its outer end communicating with said gaseous fuel "supply. chamber and its inner longltudlnal'side provided wlthfuel outlets, having the form'of radial slots which admit ribbon-like streams of gas into the mixing'chamber.

QQA carbureter comprising a mixing chamber having an outer air inlet and an inner mixture outlet a gaseous fuel supply chamber surrounding the fillXlDgClllllllbBl;

and a plurality of gaseous fuel delivery noz zles arranged radiallyin an annular row within the mixing chamber around the axis thereof and eachhaving its outer end communicating withsaid fuel supply chamber and its inner longitudinal side provided with a fuel outlet constructed to admit a ribbon like stream-of gas into the mixing chamber,

and each of said nozzles having an outer end 7 of tubular form which is secured in the wall between said mixing and gaseous fuel supply chambers and the inner part of each nozzle being flattened so that the fiat sides are arranged in planes extending-lengthwise of" the axis of themixing chamber, V In testmiony whereof hereby affix my signature." a

SAMUEL B; nanennnrv. 

